Automatic calling device



Oct; 13, 1925.

1,556,906 J. G. BLESSING- AUTOMATIC CALLING DEVICE I Filed Oct. 22. 1921 m- Jmhn 13251555111 Patented Oct. 13, 1925.

UNITED STATES PATENTiOFFICE.

JOHN G. BLESSING, or cnIcAeo, ILLInoIs, ASSIGNOB TO AuromA'rrc m COMPANY, or CHICAGO, ILLINOIS, A CORPORATION or rumors AUTOMATIC eALLme nnvIcE.

Application filed October 22, 1921. Serial No. 509,488.

To all whom it may concern:

Be it known that I, JOHN G. BLEssINo, a. citizen of the United States of America, and a resident of Chicago, Cook County, and State of Illinois, have invented certain new and useful Improvements in Automatic Calling Devices, of which the following is a specification.

My invention relates in general to a calling device or impulse transmitter commonly used for transmitting calling impulses to control switches used in the operation of standard two wire automatic telephone systems. 1

Among the objects of my invention are to provide an improved type of mechanism having all parts readily accessible for adtion which is to follow.

Referring to the drawings, Fig. 1 shows a front View of my improved calling device.

Fig. 2 shows a rear view of the device.

Fig. 3 shows a rear view of the finger hold dial and driving gear.

Fig. 4 shows a front view of the device with. the number dial and the parts shown in Fig. 3 removed.

Fig. 5 is a side view of the device with the finger stop removed.

Fig. 6 shows a portion of a rear view of the device as it is being operated as indicated by the arrow preparatory to transmitting impulses.

Fig. "his a view similar to Fig. 6 and shows the device as it is operating as indicated by the arrow, to transmit impulses.

Fig. 8 shows a side view of the cam 9.

1 will now des-rihe the various parts of the calling device more in detail and ex plain the operation of the same reference being made to the various figures of the drawings.

My improved calling device consists of a" mounting plate 2 the outer edge of which is turned up, forming a shallow cup as shown in Fig. 5, in which is fastened the number dial 18 (Fig. 1). A central portion of the plate 2 is cut away and a bridge is fixed across the opening to form the bracket 26 (Fig. 2 and Fig. 4). The central portion of this bracket is provided witha. shaft 27 wh ch is permanently fixed thereto and which extends up and through the fin 1' hold dial 1. Mounted on this shaft and ying flush against the bracket 26 is the spring ad usting member 14. This member which carries a sleeve to which is affixed the lug 15 (F 1g. 4) is normally prevented from rotating on the shaft 27 by the screw 19 (Fig. 2). To ad ust the tension of spring 17 it 18 only necessary to partially withdraw screw 19 and rotate the member 14 until the desired tension is obtained. On the rear of the mounting plate 2 is also provided a. bracket 28 (Fig. 2) which serves as a support for the spring combination comprising the springs 5, 6, 7, and 8. Bracket 29 serves as a bearing for one end of the shaft 24, while the other end of the shaft is held in an adjustable screw fastened to the bracket 30. Bracket 33 is held to the bracket 29 by screw 32 and provides'a bearingfor the shaft 35; the other end of the shaft 35 is held by the bracket 34. The brackets 11, 11 and 11" (Fig. 2) are used to attach the device to the base of the telephone in the usual manner. On shaft 24 is mounted an impulse cam 9, worm gear 10, and worm wheel 13. Worm wheel 13 is permanently in engagement with worm gear l2. \Verm gear 10 is permanently in engagement with worm wheel 4. On the shaft 24 is a fixed dog 21 (Figs. 6 and 7). The worm gear 10 carries a dog 36 which cooperates with the dog 21 to drive the cam 9 and the worm wheel 13 during the impulse sending period. The finger hold dial 1 and the main drive gear 4 are built as a unit. the portion 23 (Fig. 5) serving as a spacing member only and the whole is mounted on the shaft 27 and rotatably retained thereon by the screw 3. The worm wheel 13 is provided to drive the worm gear 12 which is a portion of shaft 35 on which is mounted the fan 22 which acts as a speed regulating element. The gear 4 (Fig. 3) dished out to form a retaining cup for the driving spring 17. The driving sprin 17 has its inner end fastened to lug 15 ig. 4) and its outer end to wall of the cup, and is normally partially wound up. Under this normal tension of spring 17 the insulation :10 mounted on gear 4 is heldagainst spring 6 to hold open springs and 6. The blank space or double tooth 16 is provided on the gear wheel 4 primarily to act as a stop for the gear wheel 4 and to prevent the spring 17 from unwinding beyond this fixed point and also serves to prevent the winding up of the spring should the operator disregard The moment the operator started to move,

the dial the insulation 20 was moved from the spring 6, which allowed the closure of springs5 and 6. The rotation of the gear 4 also carried the dog 36 out of engagement of the dog 21', thereby preventing any movement of the shaft cam or governor at this time. The operator upon removing her finger permits the finger hold dial 1'to return to normal under the tension stored up in the power spring 17. The moment the.

dial starts on its return movement the worm 10 carries the dog'36 back into engagement with the dog 21 as shown in Fig. 7 causing the shaft 24, cam 9 and worm wheel 13 to be also rotated the same number of revolutions as was the worm 10 in its initial movement. The speed or rotation on the return pulse sending cam or the governor.

movement is governed by the braking eflect of the fan 22. The cam 9 is rotated until the gear i-has returned to its normal, position, at which time the shunt springs 5 and 6 are again opened by the insulation 20 and the worm 10 is brought to a stop in its original position by the blank space or double,

tooth 16.

It will be seen that I have provided an impulse sender of very simple construction,

which has no ratchet mechanism and in which the dial carries the operating gear 4 with it in both directions. possible by the clutch arrangement con sisting of the dogs 21 and 36 which permit free forward rotation of the dial, gear 4 and worm 10v without any effect on the e clutch acts automatically on the return movement of the dial to instantly associate the impulse sender and the governor with the gear 4 all moving together.

It should be understood that, while I have chosen to illustrate my invention using a governor depending wholly upon the air braking effect, any approved type of governor may be substituted.

It will-be seen that I have provided a very simple and eflicient type of calling de- This is madespring cup and a main driving gear, a second unit con'iprising,a'shaft, a cam, a worm wheel and a worm carrying a clutch surface,

said first unit manually operable in one direction to operate the worm of the second unit independent of any movement of said shaft and worm wheel, and means for operating said first unit thereafter in the opposite direction to make said clutch efiective to cause said second unit to operate said springs.

2 In an impulse sending device, shunt sprmgs, a finger hold dial having a worm .wheel fixed thereto, means on said wheel for normally holding open said springs, said means removed u on initial operation of the dial to allow sai springs to close.

3. In' an impulse sending device, a source of power, impulse springs, a rotatable shaft having a cam and a clutch surface fixed thereto, a worm on said shaft having a clutch surface, means for rotating said worm in two directions, the movement in one direction being independent of .any movement of said shaft, and the movement in the other direction causing said worm to rotate said shaft by means of said clutch to cause said cam to operate said springs.

4. In an impulse sending device, an impulse cam, a rotatable worm wheel, a worm gear permanently in mesh with said wheel, means for driving said wheel in one directionv for causing said worm gear to operate in a plurality of directions, said worm gear first moving in a direction to engage said cam and thereafter moving in another direction to rotate said cam.

5. In a calling device, an impulse cam, a train of gears rotatable in two directions,

one of said gears also movable endwise, and

means associated therewith effective only when rotating in one direction for causing the. operation of said impulse cam.

6. In an impulse sending device, a worm ear, means for rotating said gear in two irections, an impulse transmitting cam operatively associated with said gear during one direction of rotation, said means causing said gear when rotated in the other direction to be disassociated from operative relation to said cam.

7. In an impulse sender, a unit comprising a finger hold dial and worm wheel rotatable in two directions, a worm gear driven by said wheel, an impulse sending cam normally in operative relation with said gear, and means for moving sald worm gear out of operative relation with the cam rotated in the other direction.

in one direction.

9. In an lmpulse sending devlce, a finger 8. In an impulse sending device, acam interrupter, a unit comprising a finger hold dial and gear rotatable in two directions, another gear in mesh withsaid first gear and rotating therewith at all times, the ro tation of thefirst gear also being effective to move the said last'gear to cause the same torotate said cam only when the unit moves v v a hold dial,a gear'rotated thereby in two directions, an impulse sending cam, a second gear rotated by said first gear to'operate said ca1n,,the rotation of said first gear in each direction causing both a rotation. and an endwise movement of said second gear.

10. In an impulse sending device, a' finger hold dial, a gear rotated thereby in two directions, an impulse sending cam, a second" gear rotated by said first gear to operate said cam, the rotation of said first gear in each direction causing both a rotation andv an endwise movement of said second gear,-

the endwise movement of said gear associating and disassociating the gear and cam.

11. In an impulse 'sendin device, a governor, a train of gears 01' operating said governor, another train of gears including a gear of said first trainoperable in two directions, and means associated therewith effective only when operating in one direction for causing the operation ofthe remaining gears of said first train;

12. In an impulse sending device, a rotatable governor, a gear train comprising a worm and worm wheel, said gear train operable to rotate said governor, another gear train comprising a worm and worm wheel operable in two directions and means associated therewith efi'ective only when operating in one direction for causing the operation of said first gear train.

13. In combination, a calling device provided with impulse mechanism, driving mechanism normally in operative relation with said impulse mechanism, a common shaft for supporting said mechanisms, means for moving the driving mechanism for a limited distance to disen age itself from the impulse mechanism setting movement and for returning said driving mechanism at the beginning of the uring the restoring movement.

14. In a calling device, a spring cup, a power spring having its outside end attached to said cup, a rotatable disc closing the end of said cup and having a hub to which the inside end of said spring is attached, and

means for securing said disc in different positions to adjust the tension of said spring.

- 15. In a calling device, aspring cup,a coil spring inside said cup and having its outside end attached thereto, a flat rotatable tached, said disc having a series of notches cut-in its periphery, and a member for engaging any one of saidnotches to secure the disc in any desired positionfor the purpose of regulating the tension of said spring.

16.- In a calling device, a finger dial rotatable forward and backward, a worm wheel attached to said dial, a shaft carrying a loose worm engaging with said worm wheel, impulse mechanism and a governor driven by said shaft, and a ratchet connection between the shaft and worm, whereby the said shaft is operated only on the backward movement of the dial.

17. In a calling device, the combination w th an impulse sendrng mechanism and a drivlng clutch, of a single power spring .disc closing said cupand having a hub to which the inside end of said spring is atfor operating said mechanism by means of said clutch and for maintaining the two members of said clutch in engagement with each other.

18. In a calling device, a worm wheel rotatable forward and backward, a Worm engaging said worm wheel, a shaft on which said worm is rotatable and movable end tension of said spring by changing the relative positions of said cover and said cup.

In witness whereof, I hereunto subscribe my name this 14th day of October, A. D., 1921.

JOHN G. BLESSING. 

